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Service and 

Maintenance 

Manual 



HS-l/2 

Paper Handler/Stacker 
for FS-1500[A]/FS-3500[A] 
Revision 1.02 



cftKyocERa 



©1993 by Kyocera Corporation, 2-14-9 Tamagawadai, Setagaya Ward, Tokyo 158 Japan 
All rights reserved. 

Revision 1.00 May, 1993 

Revision 1.01 June, 1993, Replaced pages: 5-1 to 5-10 

Revision 1.02 Aug., 1993, Replaced pages: 3-5, 3-6, and 3-8 



©1993 by Kyocera Corporation, 2-14-9 Tamagawadai, Sctagaya Ward, Tokyo 158 Japan 
All rights reserved. 

Revision 1.00 May, 1993 



NOTICE 



PREFACE 



The information in this manual is subject to change without 
notification. Additional pages may be inserted in future edi- 
tions. The user is asked to excuse any technical inaccuracies 
^ it typographical errors in the present edition. 

No responsibility is assumed if accidents occur while the ser- 
vice person is following the instructions in this manual. 

The contents of this manual are protected by copyright. No 
part of this manual may be reproduced or copied by any 
means without the permission of the copyright holder. 



INFORMATION 

This equipment has been tested and found to comply with 
the limits for a Class B digital device, pursuant to Part 15 of 
the FCC Rules. These limits are designed to provide 
reasonable protection against harmfuil interference in a 
residential installation. This equipment generates, uses, and 
can radiate radio frequency energy and, if not installed and 
used in accordance with the instructions, may cause harmful 
interference to radio communications. However, there is no 
guarantee that interference will not occur in a particular in- 
stallation. If this equipment does cause harmful interference 
to radio or television reception, which can be determined by 
urning the equipment off and on, the user is encouraged to 
_ <-ry to correct the interference by one or more of the following 
measures. 

Reorient or relocate the receiving antenna. 

Increase tlie separation between tlie equipment and receiver. 

Connect the equipment into an outlet on a circuit different 
from that to which tlie receiver is connected. 

Consult the dealer or an experienced radio / TV technician for 
help. 

Changes or modifications not expressly approved by the 
manufacturer for compliance could void the user's authority 
to operate the equipment. 



This manual contains information pertaining to 
service and maintenance of the Kyocera 
sorter/stacker. The information in this manual 
contains the following chapters: 

Chapter 1: General Information 

Chapter 2: Maintenance 

Chapter 3: Parts Catalog 

Chapter 4: Hardware Notes 

Appendix: Schematic Diagram 

Legend 

Throughout the manual, WARNING denotes 
precautions which, if ignored, could result in per- 
sonal injury, and/or irrevocable damage to the 
equipment. Note denotes precautions which, if ig- 
nored, could result in damage to the equipment. 



NOTE ON USING SERIAL INTERFACE 

The HS-1 kit, when purchased in European countries, in- 
cludes a ferrite noise absorber that should be installed onto 
the serial interface cable, if the printer is connected to the 
•:omputer through the serial interface. Instruction on how to 
nstall the noise absorber is provided with the package con- 
taining the noise absorber and ROMs. 



IMPORTANT NOTICE TO SERVICE PERSON 

Before attempting service on the equipment, including disas- 
sembling, re-assembling, troubleshooting, and adjustment, 
read this manual carefully. During performing service, use 
extreme care to avoid possible electric shock hazard, burn, 
and human injuries. Make sure the printer is not provided 
with any safety facilities other than those primarily intended 
for the safety of users. 



Chapter 1: General information 



Table of Contents 



1.1. General, 1—3 

1.2. Product Description, 1--1 

1.2.1. Original packing list, 

1.2.2. Names of parts, 1 — 4 

1.3. Precautions concerning service and maintenance, 1— € 

1.3.1. Precautions, 1 — 6 

1.3.2. Replacement parts, 1 — 6 



This page intentionally left blank 



1—2 



1.1. General 



This chapter explains basic considerations and precautions to be observed when reparing, 
maintaining and inspecting the paper handler/stackers HS-1 and HS-2. The precautions are 
fairly extensive; however, to prevent accidents, it is very important that the service person 
read the precautions carefully, and observe them at all times. 

This chapter also includes the names of the parts of the product, instructions for installa- 
tion of the product, and the specifications. 



1—3 



1.2. Product Description 

The paper handler/stacker HS-1 is intended for use with printer model FS-1500/A; and HS-2 
IheuS andCradl" h ^^ m ° deI FS * 35 °° /A - (The /A re P^sents the units produced for 

^niT r Jf adlB ??!? B ; is 1 mounted at the back of the printer when the printer is in- 
stalled together with the duplexer (DU-1) and routes paper which has its one side printed 
towards the inlet slot on the rear side of the duplexer for printing on the other side. Due to 
d fference in the heights of the two printer models, the HS-2 is supplied with a base ^S 
mis in the distance between the paper handler/stacker's bottom and ihe top of the du^Ler 

500 SLti 8 *" faCe " UP ^ ^ ° f ^ Prfnter ^ ~«* ^PP^ately 

The paper handler/stacker has a motor and rollers to drive paper as it passes through the 

irH^t^w ^ *? bUm - in eleCtr0nicS for Contro ^ the m 'tor. TecS £ 
planation for the electronics circuits is made in chapter 3, Hardware Notes, in this manual. 

£=3 ° Perati0nS ° f to **" •» ™* **« * ^e paper 

1 .2. 1 . Original packing list 
oJanE handler/stacker pack& ^ contains e *<* of the following items in the indicated 

♦ HS-1 or HS-2 paper handler/stacker, 1 

♦ Base for HS-2 paper handler/stacker (not required/supplied for HS-1), 1 

♦ Instruction manual, 1 

1.2.2. Names of parts 
The paper handler/stacker has the following parts. See figure on next page. 
«Connector» The connector mates with a connector on the printer. 
«Hooks» The hooks fit into mounting slots on the rear of the printer. 

"Magnetic fasteners, The magnetic fasteners stick to the printer's metallic chassis, holding 
the stacker firmly to the printer's rear side. naming 



1—4 



FIG. 1.1. PARTS OF THE PAPER 
HANDLER/STACKER 



Hooks 




Magnetic 
fasteners 



Top cover 




Base (for 
HS-2 only) 

«Top cover/rear cover» The covers open to allow access to the interior of the stacker in the 
event of a paper jam. 

«Base» Relays paper between the paper handler/stacker and option units such as the PF-5 
paper feeder. The base is included only in the HS-2 kit for the FS-3500/A, and is not used 
when printing with the FS-1500/A. 

«Tabs» Fit to the left and right edges of the printer's rear panel. 



1—5 



1.3. Precautions concerning service and 
maintenance 



Only a qualified technician should perform service on the equipment, who is familiar with 
fundamental safety countermeasures as dictated for all electronics technicians. Observe the 
following precautions during service and maintenance of the sorter. These are to prevent 
the possible personal injuries to the technician and the damage to the equipment. 



1.3.1. Precautions 

Always observe the following precautions when maintaining or inspecting the paper hand- 
ler/stacker. 

♦ When performing any maintenance or inspection procedure, first unplug the 
power cord. Make sure that the printer power is turned off before replacing 
circuit boards or electrical components in the paper handler/stacker. 

♦ To prevent electrostatic discharge damage to electrical circuits, be sure to 
wear an antistatic band when handling the circuit boards. 

♦ Be particularly careful when reconnecting the power after having repaired 
or replaced a component that has the potential for causing an electric 
shock. 

♦ If the paper handler/stacker is to be transported or stored for a lengthy 
period of time, the unit should be packed in its original packaging. 

♦ If packed in their original packaging, these units can be stacked five high 
for up to six months. They should not be stacked sideways or upside down, 
however. 

♦ Store the paper handler/stacker in a cool, dark, dry area. Avoid storage in 
dusty areas. 

♦ Ship units out on a first in, first out basis. 



1.3.2. Replacement parts 

Be sure to use only Kyocera-recommended supplies and components. Kyocera assume no 
liability in the event of damage resulting from the use of unauthorized components. 



1—6 



Chapter 2: Maintenance 



Table of Contents 



2.1. Introduction, 2—2 

2.2. Disassembly procedures, 2—3 

2.2.1. Removing the cover, 2 — 3 

2.2.2. Belt hookup, 2—4 

2.2.3. Drive gears arrangement, 2 — 4 

2.3. Cleaning procedure, 2—5 



HS-1/2 SERVICE MANUAL 



2.1, Introduction 



This chapter explains the following subjects: 

Section 2.2 explains with illustrations the disassembly procedures required to replace parts. 
It also contains the driving belt hookup and gears meshing for easy reassembly. Section 2.3 
explains procedures for lubricating those parts inside the paper handler/stacker which re- 
quire periodic lubrication. 



2—2 



HS-1/2 SERVICE MANUAL 



2.2. Disassembly procedures 



This section provides procedures for disassembling the paper handler/stacker. The exploded 
diagram in chapter 5 will also help locating the components. xpioaea 

Before beginning any disassembly procedure, be sure to read the notes below: 

♦ Before removing the paper handler/stacker from the printer, be sure to turn 
otl the printer power and disconnect the connecting cables that may be run- 
ning underneath the paper handler/stacker. 

♦ Be sure to use the correct screws when installing a component. Using incor- 
rect screws can result in the threads of the screws being stripped, which 
may lead in turn to other problems. Frequent insertion and removal of self- 
tapping screws can cause damage to screw holes. Do not tighten screws 
excessively. 

♦ When removing or installing circuit boards, wear a gounrded wrist strap to 
protect against damage due to discharge of static electricity. 

frnm'ZT^ 1 !? ' T k ? T"? Pri ^ ter P ° Wer is switched off - Remove the face-up stack tray 
P and handler/stacker. Remove the paper handler/stacker from the printer's rear 



2.2.1. Removing the cover 



Tojemove the cover, open the top lid as shown below. Remove four screws. Remove the 

FIG. 2.1. REMOVING 
THE COVER 

Cover 




2—3 



HS-1/2 SERVICE MANUAL 



2.2.2. Belt hookup 



FIG. 2.2. BELT HOOKUP 




2.2.3. Drive gears arrangement 
NOTE: The gears no periodic lubrication. 



FIG. 2.3. GEAR 
ARRANGEMENT 




NOTE: Gears are oiled at the factory. 
Do not touch them by naked hand. 



2—4 



2.3. Cleaning procedure 



After the paper handler/stacker has been used for a certain period of time, tiny paper scraps 
and dust will begin to accumulate on the rollers. Because these scraps and dust will hamper 
proper paper feeding, periodic cleaning is necessary using the procedure explained below. 

Open the top lid. Clean the feed rollers with a cloth moistened with alcohol. 



FIG. 2.4. CLEANING 
ROLLERS 




2—5 



Chapter 3: Parts catalog 



Table of Contents 



3.1. Introduction, 3—3 

3.1.1. Ordering, 3—3 

3.2. Exploded view (HS-l/HS-2), 3-4 

3.3. Exploded view for HS-2 base unit, 3—7 



This page intentionally left blank 



3—2 



3.1. Introduction 

This chapter lists the main parts of the paper handler/stacker and shows exploded view of 
the major assemblies. Note that the HS-1 and HS-2 are the same in the exploded view 
except that the HS-2 has an extra base unit which is shown in section 3.3. 

The headings in the parts tables are explained below. 

REF.: The reference number that corresponds to the part in the exploded view. 

PART CODE: The part code of the part. 

DESCRIPTION: The name and model of the part. 

QTY: The quantity of that particular part used in the paper handler/stacker. 

Recommended parts: A recommended part is indicated in the REMARKS column. 

3.1.1. Ordering 

SZ^, parta D a f ^ PaF ? remarked specifically as Recommended in the 
REMARKS column. Part codes for other parts are shown only for reference purposes To 
avoid errors in parts orders, always specify the following information: 

Part description 

Part code 

Quantity required 

Reference number in the exploded view 



3—3 



3.2. Exploded view (HS-l/HS-2) 




3-^ 



1 REP. 


PART CODE 


DESCRIPTION QTY REMARKS 


01-001 


5MVB877SH004 


COVER 


1 




01-002 


5MVB872SH012 


LID TOP 


1 




01-003 


5MMX621LD006 


SPRING ROLLER 


3 




01-004 


5MVX211DB011 


LEVER LOCK 


2 




01-005 


5MVB872SH013 


LID REAR 


1 




01-006 


5MMX222LD010 


SPRING ROLLER 


2 




01-007 


5MVS739SH001 


COVER CONNECTOR 


1 




01-008 


5MMX711AD002 


BRUSH EXIT 


1 




01-009 


5MVM273DB003 


ROLLER PINCH 


8 




01-B01 


5MBTPB3008TN 


BIND T.T SCREW (+) 


2 




01-B02 


5MBTPB3006WZ 


BIND T.T SCREW (+) 


3 




01-B04 


5MBCS2025XSP 


CS STOP RING 


2 




01-B05 


5MBCS3025XSP 


CS STOP RING 


2 




02-001 


5MVX877SH001 


BASE 






02-002 


5MVX866SH007 


GUIDE DMNER 






02-003 


5MVS667SH002 


LIDPWB 






02-004 


5MVX642SH004 


LEVER SENSOR 






02-005 


5MVX542DB002 


HOLDER SWITCH 






02-006 


5MVX832SB006 


GUIDE FLAP 






02-007 


5MVG368DB001 


GEAR Z28-P56 






02-008 


5MVG148DB018 


GEAR Z14-Z36 






02-009 


5MVG127DB029 


GEAR Z14 






02-010 


5MVG127DB030 


GEAR FEED Z14 






02-011 


5MVG327DB003 


PULLEY P17 






02-012 


5MVM177DB004 


BELT IDLE PULLEY 






02-013 


5MMS777SL004 


FRAME RIGHT 






02-014 


5MMX822SL002 


BRACKET HOOK 






02-015 


5MMS767SL005 


FRAME LEFT 






02-016 


5MVM196DB003 


PLATE ENCODER 






02-017 


5MML623DB001 


PLATE EARTH 






02-018 


5MMT875SN001 


ROLLER EXIT 






02-019 


5MMT875SN002 


ROLLER FEED A 






02-020 


5MMT875SN003 


ROLLER FEED B 






02-021 


5MMW161LD014 


SPRING SENSOR 






02-022 


5MVM150RB007 


BELT MOTOR Z70 






02-023 


5MVM170RB025 


BELT TRANS Z164 






02-025 


5MMM176CJ005 


BUSHING SBK 






02-026 


5AAYHS1***04 


DC MOTOR ASSY 






02-027 


6AAYHS1***05 


SOLENOID ASSY 






02-028 


5ESM010234***01 


MICRO SWITCH 






02-029 


5MMK224FJ001 


MAGNET 






02-030 


5MMS227SL003 


PLATE MAGNET 


4 




02-031 


5AACCNLY0GEA 


CONNCORD S00577 






02-032 


5MWSHS1***1 


SER. NO. LABEL 






02-033 


5MVX321DB014 


PLATE ADJUST 







3—5 



| REF. 


PART CODE 


DESCRIPTION 


QTY 


REMARKS 


01-001 


5MVB877SH004 


COVER 


1 




01-002 


5MVB872SH012 


LID TOP 


1 




01-003 


5MMX621LD006 


SPRING ROLLER 


3 


Recommended 


01-004 


5MVX211DB011 


LEVER LOCK 


2 




01-005 


5MVB872SH013 


LID REAR 


1 




01-006 


5MMX222LD010 


SPRING ROLLER 


2 


Recomme nded 


01-007 


5MVS739SH001 


COVER CONNECTOR 


1 


Recommended 


01-008 


5MMX711AD002 


BRUSH EXIT 


1 




01-009 


5MVM273DB003 


ROLLER PINCH 


8 


Recommended 


01-B01 


5MBTPB3008TN 


BIND T.T SCREW (+) 


2 




01-B02 


5MBTPB3006WZ 


BIND T.T SCREW (+) 


3 




01-B04 


5MBCS2025XSP 


CS STOP RING 


2 




01-B05 


5MBCS3025XSP 


CS STOP RING 


2 




02-001 


5MVX877SH001 


BASE 


1 




02-002 


5MVX866SH007 


GUIDE INNER 


1 




02-003 


5MVS667SH002 


LIDPWB 


1 




02-004 


5MVX642SH004 


LEVER SENSOR 


1 


Recommended 


02-005 


5MVX542DB002 


HOLDER SWITCH 


1 




02-006 


5MVX832SB006 


GUIDE FLAP 


1 




02-007 


5MVG368DB001 


GEAR Z28-P56 


1 




02-008 


5MVG148DB018 


GEAR Z14-Z36 


1 




02-009 


5MVG127DB029 


GEAR Z14 


1 




02-010 


5MVG127DB030 


GEAR FEED Z14 


1 




02-011 


5MVG327DB003 


PULLEY P17 


1 




02-012 


5MVM177DB004 


BELT IDLE PULLEY 


3 


Recommended 


02-013 


5MMS777SL004 


FRAME RIGHT 


1 




02-014 


5MMX822SL002 


BRACKET HOOK 


1 




02-015 


5MMS767SL005 


FRAME LEFT 


1 




02-0 1G 


5MVM196DB003 


PLATE ENCODER 


1 




02-017 


5MML623DB001 


PLATE EARTH 


1 




02-018 


5MMT875SN001 


ROLLER EXIT 


1 


Recommended 


02-019 


5MMT875SN002 


ROLLER FEED A 


1 


Recommended 


02-020 


5MMT875SN003 


ROLLER FEED B 


1 


Recommended 


02-021 


5MMW161LD014 


SPRING SENSOR 


1 


Recommended 


02-022 


5MVM150RB007 


BELT MOTOR Z70 


1 


Recommended 


02-023 


5MVM170RB025 


BELT TRANS Z164 


1 


Recommended 


02-025 


5MMM176CJ005 


BUSHING SBK 


6 




02-026 


5AAYHS1***04 


DC MOTOR ASSY 


1 


Recommended 


02-027 


5AAYHS1***05 


SOLENOID ASSY 


1 


Etecommended 


02-028 


5ESM0 10234***01 


MICRO SWITCH 


1 


Recommended 


02-029 


5MMK224FJ001 


MAGNET 


2 




02-030 


5MMS227SL003 


PLATE MAGNET 


i 




02-031 


5AACCNLY0GEA 


CONNCORD S00577 


L 




02-032 


5MWSHS1***1 


3ER. NO. LABEL 


I 




02-033 


5MVX321DB014 ] 


PLATE ADJUST ; 


1 





3—5 



| REF. 


PART CODE 


DESCRIPTION 


QTY 


REMARKS 


02-034 


5MVG127DB032 


GEAR FEED Z16S 






02-035 


5MMX321SM001 


CORD KEEP 






02-036 


5AAYHS1***06 


PWB UNIT AAPRDVR2001 




Recommended 


02-037 


5AAPRSSR2001AH 


P.W. BOARD ASSY (SENSOR) 




Recommended 


02-B06 


5MBTPB3008WZ 


BIND T.T SCREW (+) 






02-B07 


5MBTPB3006TZ 


BIND T.T SCREW (+) 






02-B09 


5MBSPP2603NZ 


BIND HEAD SCREW (+) 


2 




02-B10 


5MBSPP3003NZ 


BIND HEAD SCREW (+) 


2 




02-B11 


5MBCE4060XSW 


E STOP RING 


6 




02-B12 


5MBCE4060XSW 


E STOP RING 


3 




02-B14 


5MBWW54102LD 


WAVE WASHER 


1 




02-B14 


5MBTPB3008WZ 


BIND T.T SCREW (+) 


2 




02-B15 


5MBCS5025XSP 


CS STOP RING 


1 




02-B16 


5MBTPB3010WZ 


BIND T.T SCREW (+) 


2 




02-B17 


5MBTPB3010WZ 


BIND T.T SCREW (+) 


4 




02-B18 


5MBTPB3010TZ 


BIND T.T SCREW (+) 


2 




02-B19 


5MBTPB3008WZ 


BIND T.T SCREW (+) 


2 




02-B21 


5MBTPB3004TZ 


BIND T.T SCREW (+) 


1 




02-B22 


5MBTP43006WZ 


TP TAP SCREW (+) 


1 





3—6 



3.3. Exploded view for HS-2 base unit 




3—7 



PART LIST FOR HS-2 BASE 



REF, 


PART CODE 


DESCRIPTION 


QTY 




01-001 


5MVB875SH005 


CASE 


1 




01-002 


5MMS527SL001 


ABM 


1 




01-003 


5MMT875SN004 


ROLLER FEED C 


1 


Recommended 


01-004 


5MMX322LD009 


SPRING ROLLER C 


2 


Recommended 


01-005 


5MVG138DB043 


GEAR COUNTER Z26S 


1 




01-006 


5MVG127DB032 


GEAR FEED Z16S 


1 




01-008 


5MVM273DB003 


ROLLER PINCH 


2 


Recomme nded 


01-009 


5MMS227SL003 


PLATE MAGNET 


2 




01-010 


5MMK224FJ001 


MAGNET 


1 




01-011 


5MVM176DB006 


BUSHING POM 


4 




01-B01 


5MBTP43006WZ 


TP TAP SCREW (+) 


1 




01-B02 


5MBCE40G0XSW 


E-STOP RING 

— 


4 





3—8 



Chapter 4: Hardware notes 



Table of Contents 



4.1. Introduction, 4—2 

4.2. Motor speed shifter , 4—3 

4.3. Motor driver, 4—5 

4.4. Block diagram and terminal configurations, 4—7 



4.1. Introduction 

This chapter describes the operation of the electrical circuits in the paper handler/stacker. 
Refering to the schematic diagram in Appendix while reading in this chapter will help easy 
understanding of the operation of the electrical circuits. 

The electrical circuits of the paper handler/stacker serve the following functions: 

♦ Motor speed shifter 

<♦ Motor driver 



4—2 



4.2. Motor speed shifter 



The HS-1 accordingly shifts the speed of paper transportation during duplex printing by 
means of the speed shifter circuit. While the printed paper enters the HS-1 but its end is 
yet pinched by the printer's fuser rollers, the HS-1 pulls the paper in normal (slow) paper 
transporting speed. As the paper leaves the fuser, the HS-l's motor starts to revolve in 
faster speed. 

Figure 4.1. below shows the system comprised of a speed shifter and a gain controller. The 
speed shifter changes the speed of motor revolution in three speeds of low, middle, and high. 
Three different speeds of paper transportation are necessary as the FS-1500/A (10-ppm) and 
the FS-3500/A (18-ppm) have different printing speed. 



FIG. 4.1. 
MOTOR SPEED 
SHIFTER 



HVER* I 
VLOWl 



U1 MC14052BF 



B A 



§ B § S I § B § S i 



SPEED/GAIN 
SHIFTER 




LEVEL SETTER 

V«ei«cyia_ivtOjN&ami 



4—3 



Change of mot or spe ed i s comm anded by the printer's main logic controller using instruc- 
tion signals of HVER and VLOW. The driver U3 sets up the different levels necessary for Ul 
to generate the signals for different motor speeds. 

With model FS-3500, for example, when the part of the paper is stil l bein g ca ught b y the 
fuser rollers, the printer's main logic controller sets the level of both HVER and VLOW to be 
low, requesting the HS-1 to pull the paper in normal (slower) speed. This causes the poten- 
tial at Ul pin 1x0 to receive the level necessary to provide the middle speed output for U4 
at pin lxC 

To ensure the stable revolution in each motor speed, U3 also acts to fine-tune the gain of 
Ul. The signal for this appears at pin 9 of U3 and given to pin 2x0 of Ul. 



Table 4.1. below summarizes combinations of levels for the HVER and VLOW signals to deter- 
mine the motor speed. It also shows the resistors that U3 uses to set up the levels for Ul to 
accordingly drive U4. 

TABLE 4.1. PRINTER COMMANDS LEVELS FOR MOTOR SPEED 



HVER VLOW MOTOR RELATIVE PAPER FEEDING SPEED SET- _ _ 
VLOW SpEED spE£D TING ADJ. BY GAIN ADJ. BY 


Low-level 


Low-level 


Medium 


Normal paper feeding for FS- 
3500/A (18-ppm) 


RIO and RP2 


R4andR5 


Low-level 


High-level 


Slow 


Normal paper feeding for FS- 
1500/A (10-ppm) 


Rll and RP3 


R6— R8 and C6 


High-level 


Low-level 


Fast 


Fast paper feeding for both 
printer models 


R9andRP9 


R4andR5 



Resistors and a capacitor for gain setup of Ul (R4 through R8, C6) also serve as a motor 
current limiter. The motor current is limited to 0.75A in slow mode and 1.0A in middle and 
fast modes. 

The driver U3 makes comparison of the input signal, given by Ul and arriving at pin 5, and 
the motor's encoder output, arriving at pin 4, and generates the difference signal at pin 9 
for controlling the Ul gain, thus maintaining the constant motor revolution. 



4--1 



4.3. Motor driver 



Figure 4.2. shows a simplified motor driver circuit schematic diagram. 



FIG. 4.2. MOTOR DRIVER 



+24V 



FROMfc. 
U1 ^ 




The motor is constant-current-driven. U4 continuously compares the motor speed shifter 
(Ul) output (told previously) with the current Cowing through the motor. This comparison is 
represented by the following formula: 

Vin = R32 x i (R32: Speed detection resistor) 

The U4's reference output is automatically adjusted so that the above formula is continuous- 
ly fulfilled. U6 pulse-modulates the U4 output. The complimentary buffers, Q4 and Q6 
switch Q7 on and off which finally controls the motor to revolve. 

The motor is constantly switched on and off while U4 makes comparison on the Ul output 
and the motor current. To smooth the motor revolution, diode D3 is provided to induce the 
flywheel effect which is explained as follows. (Refer to Figure 3.3. on next page.) 



4—5 



FIG. 4.3. FLYWHEEL EFFECT OF 
D3 



The current given by the +24V 
source circulates through Q7, 
etc., and chives the motor. 



At the moment Q7 is turned off, 
the flywheel current, induced by 
the electromagnetic energy 
stored in the motor's induc- 
tance, flows momentarily 
through D3 and turns the motor. 




4—6 



4.4. Block diagram and terminal 
configurations 

This section summarizes configurations of all board terminals. 
FIG. 4.4. BOARDS WIRING AND TERMINALS 



y COVER-OPEN SWITCH 




SOLENOID 



TABLE 4.2. TERMINAL CONFIGURATIONS 



BOARD 



CONNEC- 



MINAL SIGNAL NAME 



DEFINITION 



KP-280B, 
Driver board 


CN1 


1 


GROUND 


Ground 


2 


+24V 


+24V power 


3 


PAPER 


Paper is not present 


4 


COPNS 


Rear cover is open 


5 


HVER 


Speed control 


6 


FUP 


Select face-up stack 




7 


FOP 


Select face -down stack 


8 


MON 


Motor control 




9 


VLOW 


Speed control 





4—7 



1 TER- 

BOAfiD °°tor C " M'NAL SIGNAL NAME DEFINITION 


KP-280B, 
Driver board 


YC1 


1 


GROUND 


Ground 


2 


COPNS 


Rear cover is open 


YC2 


1 


LEDK 


Encoder drive signal 


2 


PULSE 


Encoding signal 


3 


GROUND 


Ground 


YC3 


1 


FUP 


Select face-up stack 


2 


+24V 


+24 V power 


3 


FOP 


Select face -down stack 


YC4 


1 


MOTOR+ 


+ motor power 


2 


MOTOR- 


- motor power 


KP-279B, In- 
terface board 


YC1 


1 


GROUND 


Ground 


2 


+24V 


+24V power 


3 


UNIT 


Option unit is installed 


4 


PAPER 


Paper is not present 


5 


COPN 


Rear cover is open 


6 


HVER 


Speed control 


7 


FUP 


Select face-up stack 


8 


FOP 


Select face-down stack 


9 


MON 


Motor control 


10 


VLOW 


Speed control 


CN1 


1 


GROUND 


Ground 


2 


+24V 


+24V power 


3 


PAPER 


Paper is not present 


4 


COPNS 


Rear cover is open 


5 


HVER 


Speed control 


6 


FUP 


Select face-up stack 


7 


FOP 


Select face-down stack 


8 


MON 


Motor control 


9 


VLOW 


Speed control 



4—8 



Chapter 5: Troubleshooting 



Table of Contents 



5.1. Introduction, 5—3 

5.2. Troubleshooting flowcharts, 5—4 

5.2.1. Paper handler cover open error, 5 — 4 

5.2.2. Paper handler cover open error — continued, 5 — 5 

5.2.3. Solenoid error, 5 — 6 

5.2.4. Motor error, 5 — 7 

5.2.5. Motor speed shift error, 5 — 8 

5.2.6. Motor speed shift error — continued, 5 — 9 

5.2.7. Paper jam does not go off, 5 — 10 



This page intentionally left blank 



5—2 



5.1. Introduction 

This chapter explains procedures for identifying and correcting problems (troubleshooting). 



5—3 



5.2. Troubleshooting flowcharts 



5.2.1. Paper handler cover open error 



(«Paper handler 
cover open» 




Close cover 
properly, 



Yes 



Turn printer power 

off. Remove and 

reinstall HS-1 to 

printer. Turn 
printer power on. 





Turn printer 
power off. 
Remove HS-1 

from printer. 



Remove Lid board. 

Remove harness from 

YC1 on driver 

board. Connect an 

ohm meter across 

pins 1 and 2 of the 

harness. 




Yes 



Replace 
driver board. 



5—4 



5.2.2. Paper handler cover open error — continued 

«Paper handler cover open» error - Continued 




Replace 

rear cover 

switch. 



Remove Lid board. 
Remove harness from 

YC1 on driver 

board. Connect an 

ohm meter across 

pins 1 and 2 of the 

harness . 



ohm when \No 
cover is closed 
and infinite ohm 
when opened? 



Yes 



Replace 
harness . 



Reinstall 

HS-1 on 

printer and 

turn printer 

power on. 




Replace 
driver 
board . 



^ En ° ) 



5—5 



5.2.3. Solenoid error 



Solenoid error 



Solenoid does 
not operate 



Turn printer power 
off. Remove HS-1 

from printer. 
Reinstall HS-1 to 

printer. Turn 
printer power on. 




Turn printer 
power off. 
Remove HS-1 

from printer. 



Disconnect 

connectpr 

between 

solenoid and 

KP-280 board. 



Measure resistance 

across pins 1 and 

2, and pins 2 and 

3. of the plug 

wired to the 

solenoid. 




Replace 
solenoid and 

printer's 
engine board. 



Replace 

printer's 

engine board. 



5—6 



5.2.4. Motor error 



Motor error 



(' 



Motor does not 
revolve 



Turn printer power 
off. Remove HS-1 

from printer. 
Reinstall HS-1 to 

printer. Turn 
printer power on. 




Turn printer power 

off . Remove HS-1 

from printer, 

Remove covers from 

HS-1, Reinstall 

HS-1 to printer. 



Turn printer power 

on. Press 

cover-open switch, 

Connect volt meter 

to the + terminal 

Df motor. Start 

printing a page. 



Replace 
driver board. 




Replace 

printer's 

engine board. 



5—7 



5.2.5. Motor speed shift error 



Motor speed shift chart 

The following chart shows transition of motor speed for the reference purpose. See next page for 
starting the actual troubleshooting regarding the motor speed shift error. 



Printing start 



High speed 
(Both printer 
models) 




The top 

edge of paper 

reaches and 

pushes the jam 

sensor located 

after the 

fuser unit. 



Low speed 
(F5-1500/A) 



Middle 

speed 

(FS-3500/A) 




The bottom 

edge of paper 

clears the jam 

sensor located 

after the fuser 

unit . 




High speed 
(Both printer 
models) 



c 



Print end 



3 



5—8 



5.2.6. Motor speed shift error — continued 



Motor speed shift error - Continued 



Motor speed \ 
does not change I 



Turn printer power 
off, Remove HS-1 

from printer. 
Reinstall HS-1 to 

printer. Turn 
printer power on. 




Yes 



( End ) 



Replace 
driver board. 




Replace 

printer's 

engine board. 



Yes 



c 



End 



3 



5—9 



5.2.7. Paper jam does not go off 



Paper jam does not go off 



Paper jam does 
not go off 



Turn pritner 

power off. 

Remove HS-1. 



Yes 



Yes 










1 


s 


Remove paper. 




/ Paper 






C sti 
n^^ indica 




Reinstall 

HS-1. Turn 

printer power 

on. 




Install lever 

sensor 

properly . 




Replace 
driver board. 



5—10